UML.Semantic.BehavioralElements.StateMachines
Class Guard

java.lang.Object
  |
  +--UML.Semantic.Foundation.Core.ModelElement
        |
        +--UML.Semantic.BehavioralElements.StateMachines.Guard

All Implemented Interfaces:

Element, ElementAtt, LinkAtt

public class Guard

extends ModelElement

A guard condition is a boolean expression that may be attached to a transition in order to determine whether that transition is enabled or not.

The guard is evaluated when an event occurrence triggers the transition. Only if the guard is true at the time the event is presented to the state machine will the transition actually take place. Guards should be pure expressions without side effects. Guard expressions with side effects may lead to unpredictable results.

In the metamodel Guard is a ModelElement so it can be substituted in refined state machines.

Constructor Summary

Guard()

Method Summary

boolean	check() Checks if well-formedness rules are respected in this model element.
java.lang.String	getExpression()
void	setExpression(java.lang.String expression)

Methods inherited from class UML.Semantic.Foundation.Core.ModelElement

add, add, getBindingList, getConstraintList, getElementType, getErrors, getHref, getId, getIdentification, getIdref, getIndex, getInfo, getIsOwned, getLabel, getLocator, getName, getNamespace, getNamespaceId, getStereotype, getTemplate, getTemplateParameterList, getTitle, getUuid, getUuidref, getVisibility, getVisibilitySymbol, getWarnings, setElementType, setErrors, setHref, setId, setIdref, setIndex, setIsOwned, setLabel, setName, setNamespace, setTemplate, setTitle, setUuid, setUuidref, setVisibility, setWarnings

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Guard

public Guard()

Method Detail

setExpression

public void setExpression(java.lang.String expression)

getExpression

public java.lang.String getExpression()

check

public boolean check()

Checks if well-formedness rules are respected in this model element.

Overrides:

check in class ModelElement

Returns:

True if check was successful, false otherwise.